Improvement in pumps



UNITED STATES PATENT OFFICE.

JOSEPH lV. DOUGLAS, OF MIDDLETOVVN, CONNECTICUT, ASSIGNOR TO W. 85 B. DOUGLAS, 0F SAME PLACE.

Specification forming part of Letters Patent No. 56,671, dated July 24, 1866.

To all whom 'it may concern:

Be it known that I, JOSEPH W. DOUGLAS, of Middletown, in the county of Middlesex and State of Connecticut, have invented a new and useful Improvement in Pumps; and I do hereby declare that the following is afull, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming a part of this specifcation, in which- Figure l is an axial section of a pump made according to my invention. Fig. 2 is a peripherical view, the side chamber being presented toward the observer.

Similar letters of reference indicate like parts.

This invention enables one to produce a double-acting pump with only one side pipe. The piston-rod is hollowr and receives the liquid which is forced upward through the piston, while the liquid which enters the pump-cylin der through the side pipe is received in the top of the piston and is forced thence through the piston-rod to the top of the pump.

The letter A designates the barrel of the pump, having at one side a pipe or channel, I, which extends in length from the level of the lower or stationary valves up to the top of the cylinder L, in which the piston works, into which cylinder the top ofthe side pipe is conducted just above the line reached by the upward stroke of the piston.

The bottom of the cylinder L and the bottom of the side pipe have induction-valves J J', through which they communicate with the induction-pipe K, that leads down to the water.

The piston-rod B is hollow and open at its top, and also at its lower end, where it is connected to 'the neck of the piston Gr.

The top of the cylinder of the pump is composed of a conically-shaped diaphragm, D, whose lower part has a circular ange, which is clamped between that section of the barrel which composes the cylinder and the section next above atI their joint F, the joint being made tight by a packing-ring, E.

The piston-rod B goes through the upper end of the conical diaphragm D, and is free to be moved up and down in it. The upper end of the piston-rod is enlarged, as at B', so as to touch the interior of the barrel, the lower corner of the enlarged part B' being perforated, as seen at C C, to establish communication bev tween the interior of said part B of the pistou through a hole in the bottom of the piston, and

by three or more guide-tin gers, c, that rise from the edge of the opening in the top of the valve and enter the neck of the piston. The piston has also inductionopenin gs b in its upper side, arranged around its neck, to establish communication between the interior of the piston and the upper part of the cylinder L.

The upper and lower induction-openings of the piston are closed respectively by the valvesurfaces a a', on the upper and lower sides of the valve.

In operating the pump the descent of the piston causes the valve H torise and close the induction-openings b, leaving the lower induction-passages open, when the piston is free to pass downward in the cylinder through any liquid which may be found therein. In the upward stroke the valve H falls to the bottom of the piston and prevents the return of the liquid, such liquid being lifted along with the piston, and the valve J, in the side pipe, I, being closed at the same time, because the dropping of the valve H opens communication between the interior of the piston, the top part of the cylinder L, and side pipe, I.

The valve J will be opened when the piston rises by reason of the creation of a partial Vacuum in the lower part of cylinder L, which will become illed with liquid through pipe K. On the next descent of the piston, the valve H being thrown up so as to close the openings b, a partial vacuum will be formed in the upper part of cylinder L and in the side pipe, I, when the valve J will be forced open by pressure from below and the liquid will rush in from pipe K. When the piston is again drawn upward the valve J, will he closed and the liquid in the upper part of cylinder L hein g i'reeto enter the piston, will he forced upward through the piston and out of the pump. The conical diaphragm D Will be constantly surrounded by liquid, and the joint, where the pistonrod passes through it, is consequently made tight by a liquid packing, which is easily displaced before the descent of the piston, by reason of the openings C in the corner of the enlargement'B. A

It results from this construction that I produce a double-acting pump with only1 one side pipe.

What I claim as new, and desire to secure by Letters Patent, is

The combination of the diaphragm D, hol lo7 piston-rod B, having a perforated enlargement,B/, and piston Gr, as described, Valve H, with its spindle d and guide-lingers c, cylinder L, and side pipe, I, provided with Valves J and J', all arranged and operating substantially as described, for the purpose specified.

JOS. W. DOUGLAS.

Witnesses JN0. M. DOUGLAS, IRA GARDINER. 

